The horn is inside the driver side fenderwell. I saw it doing my FWI. The door locks are controlled by the master switch in the driver side door. It may be faulty. Do you have anything in the OBD-2 port? I had a problem where my autotap was only partially in the port and was causing all kinds of wierd electronic behavior. Doors wouldnt unloock, the radio cycled through locked, calibrate, on and off...very wierd.